StaxRip Problem (AVISynth version)

anyone know how to get staxrip to stop whining about avisynth not being downloaded properly? i'm pretty sure i have the version it's looking for (2.5.7) and i've tried browse but it keeps saying unknown version... I haven't tried processing anything yet... will it work even if it thinks it's the wrong version?? this is an extremely useful and customizable tool when it works... thanks in advance

ok so apparently the trick is installing the official package (instead of just loading the dll in the sys32 directory)... this probably makes me look like an idiot, but i really don't care because it's working now